| Rank* | Country | Score |
|---|---|---|
| 1. | Singapore | 606 |
| 2. | Korea | 605 |
| 3. | Hong Kong | 602 |
| 4. | Chinese Taipei | 591 |
| 5. | Japan | 585 |
| 6. | N. Ireland | 562 |
| 7. | Belgium | 549 |
| 8. | Finland | 545 |
| 9. | England | 542 |
| 10. | Russia | 542 |
| 11. | United States | 541 |
| 12. | Netherlands | 540 |
| Canada (Quebec) | 533 | |
| Germany | 528 | |
| Canada (Ontario) | 518 | |
| Australia | 516 | |
| Italy | 508 | |
| Sweden | 504 | |
| New Zealand | 486 | |
| Iran | 431 | |
| Yemen | 248 | |
| *The top 12 groups are listed in order, but after that not all the jurisdictions that took the test are listed. Some nations have improved over the past 15 years (notably, Hong Kong, England) and some have declined (Austria, Netherlands), but most continue about where they have always been. | ||
| Sources: Mullis et al., 2012a; Provasnik et al., 2012. | ||